Spraying apparatus



v v N 69 8mm Jam J7; Ve/z for A Ltaraegs.

Patented Oct. 19, 1937 a Y 2,096,196.

: NITE STATES PATENT o;FFicE"-If 4 Application February 26, 1935,SerialNo. 8,351

I In Great Britain January 12, 1935 2 Claims. 299-1401) .Thisinvention'relates to spraying apparatus the nozzle end. A bush 4 isfixed in this bore by for liquids, of the type in which air and theliqscrewed connection at its rear end., A second uid are fed toa-discharge nozzle. It is sometimes bush 5 is also fitted in alignmentin front of the requiredthats-the spray should be substantially firstbush and a valve seating 6 is-located be- 5 round,-whilst atiother timesit is required to be tween the two bushes. A mushroom head valvefan-shaped; and this invention has" for its 010- 1 coacts with thisseating and is formed on the ject 'a'spray ng'apparatus, in which thespray valve stem which is screwed to the cylindrical can be very readilychanged over from one conslide block 8. A cup shaped washer 9 is fixeddition to the other and preferably whilst the between this block and acollar on the valve 10 spraying :apparatus ,is in action. stem to forman air seal in the bush 4. The trig- 10 According tothis invention, theflow of air ger 2 has an arm I0 projectingbeyon-d the pivot underpressure is controlled so that it can be axis which coacts with thesliding block, so that fed to the nozzle to either producea. round spraywhen the trigger is actuated the valve 1 is moved or a'fan-shaped spray.For this purpose a valve axially. The compressed air passes through a 5controldevice is provided-which controls the flow conduit II in the bodyof the gun and leads to 5 of. .air through two separate conduits leadingto the chamber l2 at the backof the valve seating the-spraying nozzle toproduce the round spray 6. The stem I3 of the valve is extended beyondor to produce the fan-shaped spray. Preferably the aforementioned firstvalve 1 and a second when theairis passing through the conduit to valveI4 is provided thereon. This second valve effect a fan-shaped spray, theconduit leading coacts with a conical seating formed on the in- 20 theair to form the round spray also remains side of a seating ring I5,slidably-mounted in the open.v Thevalve mechanism is convenientlyacinner sleeve bushing aforementioned. Two septuated by a single spraycontrol trigger or memarate air branch conduits i6 and: [1 .pass to-theber, so-that. the; operator can either obtain a nozzle. Perforations areformed in the wall. of round spray or the fan spray by simply operatingthe bush 5 on the outlet side of the first men- 25 the trigger whichstarts and stops and variably tioned valve 1 and-these perforationscommunicontrols the spray. The valve mechanism is concate with acylindrical recess l8 around the veniently in the form of a double valveoperated bush, from which passes the conduit; l6-which by. the trigger,and the arrangement is such that leads to an inner annular chamber 1 9;at the the .timing of the opening of the second valve in front of theframe on which the spraying nozzle 30 relation to the :first valve isadjustable. The is fixed. When the trigger is operated the first doublevalve conveniently comprises a directly valve 1 is opened and thusallows air to pass to operated valve which opens "the conduit for thenozzle for producing the round spray. The formingthe round spray, andwhich when opersecond valve l4 lieson the outlet side of the said atedsimultaneously moves the second valve. The perforations so that an airchamber 20 is' pro- 35 s in f the second valve h w v rmally vided behindthe second valve 14 and its seating. moves simultaneously with the valvesothat the The second valve is simultaneously moved with second valve,controlling the fan spray, is not the first valve, but the airpressurein the chain Opened Until the movement of the Seating s her 20 causesthe seating to slide with the valve 40 stopped by a suitable abutment.and consequently the second valve is not opened. 40 7 Referring to thedrawing 7 An adjustable stop is provided against which the Figure 1 is across sectional elevation of a valve seating l5 moves, thus preventingthe'seatspraying gun constructed according to this ining moving with thevalve head. The air can vention, and thus pass through the second valvel4 along the 5 Figu e' S OW amodified form of valve mechbush 5 to theaxially arranged conduit I! leadanism. ing to an outer annular chamber22 at the According toa convenient embodiment of the nozzle end of thegun frame, A spiral spring 23 invention, the apparatus comprises theframe I bears against the head of the second valve to of a spraying gunon which is mounted a connormally press the valves I4 and] into the troltrigger 2. The needle valve 3 controlling the closed positions. Theadjustable stop conven- 50 liquid coacts with a trigger 2 intermediateits iently comprises arotatable pin 29 having around pivot axis and theouter end or finger grip of abutment head 30, one half of which is cutaway. the trigger. The upper portion of the gun frame By rotating thispin, the movement of the slidis bored longitudinally in a directionwhich inable valve seating 15 is'adjustably limited, so. that clinesinwardly from the back end of the gun to the second valve M can bearranged to open at 55 are opened one immediately or almost immediatelyafter the other. At the other end of the adjustment, the round spray canbe fed by a more fully opened liquid needle valve 3 with the full 1 airpressure without the fan shaped spray being obtained. The nozzle'end ofthe gun frame has thus two annular chambers l9 and 22 which are closedby a screwed distributorgsleeve 24 receiving Openings are provided inthe front the nozzle. of this sleeve 24 leading to appropriate channelsin or around the nozzle and in the air cap to Y give the spray. Theadjustable pin aforementioned may be mounted in a bush 25 screwed on theframe i and the outer end of the pin may be fitted with a head 26 whichcoacts with spring controlled or other stops to facilitate quickadjustment to; obtain any desired condition of spray. f I

According as shown by Figure 2, the secondvalve I4 aforementioned. maybe substituted by a ball 21 which beds on the slidable seating sleeveI5a aforementioned. This slidable seating sleeve may coact with anadjustable stop 28 screwed in the frame axially of thesliding seating.

Withthis construction andwith the setting shown by Figure 1, when thetrigger 2 is first moved, the valve 'Ia'is opened and air is fed to thenozzleby way of the conduit IGaa A small opening of the valve la allowsair to flow at substantially full pressure. The needle valve 3a is alsoopened, but the arrangement is such that it is opened after the airvalve is opened. On

the further movement of the trigger the liquid valve is further opened,thereby giving a variable round spray. On the further movement of the,

trigger the seat [5a moves against the stop 28 and air flows to produce'a fan-shaped spray. By adjusting the stop 28, the fan spray can beproduced at any suitable point of the trigger movement, andtherelationship of the opening of the needle valve can be arranged'toprovide for a variable fan spray. 7 K

I claim: 7 Y 7 .1. Apparatus for spraying liquids or other material,comprising a frame, 'a spraying head carried by the frame, at whichoccurs, alternatively,

round and fan shaped sprays, a needle discharge valve coacting with aseating in the spraying head for the material to be sprayed, a handcontrol device for moving the needle valve, an air valve slidablymounted in an air chamber in the frame, an air main feed conduit leadingto one to a modified form of the invention;

side of the air valve, an air chamber on the other side of the saidvalve, a branch air conduit passing from such chamber and leading to anannular branch conduit opened to the said air chamber 7 by the secondmentioned valve and leading to a' second annular chamber at the sprayinghead for supplying air toproduce a fan-shaped spray,

and means for actuating the valves bythe said 'h'and controldevice toopen the valves succs sively, 7 V I 2. Apparatus for spraying liquids orother 'material, comprising a frame, a spraying head; carried by theframe, at which occurs, alternatively, round and fan shaped sprays, aneedle discharge valve coacting with a seating in the spraying head forthe material to be sprayed, a trigger pivoted to the frame for movingthe needle valve, an air valve slidably mounted in an air chamber inthe,

frame, an air main feed conduit leading to one 7 side of the air valve,an air chamber on-the other side of the saidvalve, a'branch airco-nduitpass ing from such chamber and leading-to'anannulus atthespraying'head forvsupplying air to produce around spray, aslidablym'ounted'valve seating and valve thereonforming a plungerclosureat one end of the said air chamber and arranged axially ofthe,first'mentioned'valve, means in? terconnecting the said twovalves'fsothat when the first mentioned valveis opened the secondmentioned valve is moved axially followed by, the

seating under air pressure so that this second valve is not opened, anadjustable stop for lim iting the movement of the said slidable valveseat and to thereby open the valve, an air branch conduit opened to thesaid air chamber, by'the second mentioned valve and leading to' a secondannulus at the spraying head for supplying air I to produce a fan-shapedspray, and means con-. necting the said trigger and'the first mentionedvalve so that the trigger successivelyaopens the valves andcontrolsthefeed of the material to be sprayed and the air feed to formsuccessively either a round or fan-shaped spray.

